Process for the preparation of wet rubber masterbatch, wet rubber masterbatch, rubber composition and pneumatic tire

摘要

It is an object to provide a process for the production of wet rubber masterbatch which can be used as raw material for vulcanized rubber having excellent tear and tensile properties, and which allows to be molded as a wet rubber masterbatch in a short time. A method which comprises a process in which the aggregation of granules containing a plurality of granular coagulums prepared from a mixture of a filler and a rubber latex solution, and a process in which the aggregation of granules is less than that of the formula 1 under sufficient conditions, it is possible to prepare a wet rubber masterbatch which can serve as a raw material for vulcanized rubber, which has excellent tear and tensile properties and can be molded in a short time. 3 ≤ P × Da ≤ 500 (Formula I) In Formula I, P indicates the pressure (kgf / cm 2) applied to the aggregation of granules. This indicates the granule diameter of the granular coagula in units of mm.